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基于层次分析和模糊综合评判的矿石分割模型

绵阳师范学院学报 2024年第2期43卷 98-105页

作者：林雪华陈雁冰福州职业技术学院信息工程系福建福州350108 福建技术师范学院大数据与人工智能学院福建福清350300

建立矿石分割综合评判的因素集,运用层次分析法和模糊数学的基本原理对矿石分割过程中是否二次分割进行综合评判.在评判过程中综合考虑矿石的面积、周长、形状因子、梯度和平滑度等特征参数,通过层次分析法得到各参数的影响权重向量,将... 详细信息

建立矿石分割综合评判的因素集,运用层次分析法和模糊数学的基本原理对矿石分割过程中是否二次分割进行综合评判.在评判过程中综合考虑矿石的面积、周长、形状因子、梯度和平滑度等特征参数,通过层次分析法得到各参数的影响权重向量,将是否二次分割的评判结果转换隶属函数,从而建立模糊综合评判模型.将该算法应用于矿石分割中,分割效果良好.

关键词：矿石分割综合评判层次分析法模糊综合评判

一种新型可见光响应催化剂改性PATFC膜的制备及其抗污染性能

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环境工程学报 2024年第3期18卷 676-685页

作者：李冬梅吴汉杰刘小勇蒋树贤陈璟恺林廷翰张刚毅陈彦冰广东工业大学土木与交通工程学院广州510006 广东海洋大学机械工程学院阳江524088 华南师范大学计算机学院广州510631

以AgI、氧化石墨烯(GO)和超薄g-C_(3)N_(4)(UCN)为前驱体,通过超声结合化学沉淀法合成可见光响应AgI@GO@UCN(AGU)光催化剂,然后采用氮气压滤与界面聚合结合,将AGU负载于支撑基底聚酰胺膜(PATFC膜)表面,得到AGU改性PATFC膜,并对其制备条... 详细信息

以AgI、氧化石墨烯(GO)和超薄g-C_(3)N_(4)(UCN)为前驱体,通过超声结合化学沉淀法合成可见光响应AgI@GO@UCN(AGU)光催化剂,然后采用氮气压滤与界面聚合结合,将AGU负载于支撑基底聚酰胺膜(PATFC膜)表面,得到AGU改性PATFC膜,并对其制备条件及其抗污染性能进行研究。结果表明:改性膜最佳制备条件为:AGU投加量30 mg,间二胺(MPD)水相溶液质量分数1.0‰,MPD浸泡时间2 min,均苯三甲酰氯(TMC)有机相溶液质量分数0.25‰,TMC浸泡时间45 s;在最佳制备条件下,改性膜纯水通量为21.84 L·(m^(2)·h)^(-1)(抽吸压力0.2 MPa),对刚果红(CR)截留率可达97.80%;亲水性能显著改善,水接触角由57.1°(PATFC原膜)降至40.7°(AGU改性膜);可见光吸收性能提高显著,改性膜最大光吸收边带由原膜的387 nm红移至488 nm;改性膜抗污染性能很好,其比通量由PATFC膜的69.54%提升至92.75%;改性膜具有良好的光催化自清洁特性,光照60 min后膜通量恢复率可达95.83%;改性膜稳定性较高,重复利用6次后其通量恢复率仍可达92.35%,对CR截留率为97.29%。

关键词： AgI@GO@UCN可见光催化剂 PATFC膜抗污染性能光催化自清洁特性

MEO/Ce^(4+)电催化体系的蒽醌染料(RB19)降解机理与效果研究

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环境科学学报 2024年第3期44卷 23-37页

作者：李冬梅陈彦冰蒋树贤陈璟恺张文欣张网马圳锴张刚毅广东工业大学土木与交通工程学院广州510006 广东海洋大学机械与能源工程学院阳江529500 晨星学院广州511430

以蒽醌染料活性蓝19(RB19)模拟染料废水,采用Ce^(4+)介体(MEO/Ce^(4+))电催化体系,对RB19进行电催化降解实验.对比了不同催化体系的降解性能,探讨了电流密度值、电解质种类及其浓度、初始Ce^(4+)浓度、初始pH等因素对MEO/Ce^(4+)体系降... 详细信息

以蒽醌染料活性蓝19(RB19)模拟染料废水,采用Ce^(4+)介体(MEO/Ce^(4+))电催化体系,对RB19进行电催化降解实验.对比了不同催化体系的降解性能,探讨了电流密度值、电解质种类及其浓度、初始Ce^(4+)浓度、初始pH等因素对MEO/Ce^(4+)体系降解RB19的效果,计算了不同降解驱动力的贡献率,并通过分析其氧化性中间物质种类及降解机理,探讨其可能的降解途径.结果表明:①MEO/Ce^(4+)电催化体系中产生的氧化活性物质主要有Ce^(4+)和羟基自由基,在降解RB19过程检测出9类中间态小分子有机物.②MEO/Ce^(4+)电催化体系氧化降解RB19的贡献率构成为:Ce^(4+)的催化氧化作用为主(占52.9%),直接电催化作用次之(占43.6%),羟基自由基的氧化作用最弱(占3.5%).③初始Ce^(4+)浓度对体系的氧化降解能力起决定性作用,电流密度值、电解质种类及其浓度、初始pH是影响体系氧化能力的关键因素.④新型MEO/Ce^(4+)电催化体系最佳反应条件为:电流密度值为228 A·m^(-2),电解质Na2SO4浓度为25 mmol·L^(-1),初始pH值为4和初始Ce^(4+)浓度为50μmol·L^(-1).在此条件下反应50 min,MEO/Ce^(4+)电催化体系对RB19的降解效果优于其他催化体系.其中,MEO/Ce^(4+)电催化体系去除率高达99.1%,是直接电催化(DET)体系去除率(43.2%)的2.3倍;而其降解速率为0.0804 min^(-1),是DET体系降解速率(0.01074 min^(-1))的7.49倍.(5)降解机理为:通过DET快速降解一部分RB19,另一部分R19则由强氧化活性物质Ce^(4+)完成.Ce^(4+)由溶液中的Ce^(3+)在阳极失去电子转化而成.Ce^(4+)快速将RB19氧化分解,最终产物为无机物(CO_(2)和H_(2))和小分子有机物.

关键词： MEO/Ce^(4+)电催化体系蒽醌染料RB19 氧化性中间产物降解贡献率电催化机理与效果

Dihydroanthracene bridged bis-naphthopyrans:A multimodal chromophore with mechano-and photo-chromic properties

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Chinese Chemical Letters 2024年第5期35卷 166-170页

作者： yanbing Shen Yuan Yuan Yaxin Wang Xiaonan Ma Wensheng Yang Yulan chen Institute of Molecular Plus Tianjin UniversityTianjin 300072China Department of Chemistry Tianjin Key Laboratory of Molecular Optoelectronic ScienceTianjin UniversityTianjin 300354China State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin UniversityChangchun 130012China

Mechanochromophores based on bichromic molecular switches,such as bis-naphthopyanes,allow multimodal mechanochromic behavior beyond the typical binary response from single chromophores,which is important for distinguishing between multiple stress states through discrete changes in color.Spontaneously generated persistent and distinguishable multi-colors from activated bis-naphthopyanes remain challenging.And the versatility of bis-mechanophore design for advanced optical molecular systems and the fundamental insights into the corresponding mechano-reactivity are not enough.Here,we identify a dihydroanthracene bridged bis-naphthopyrans as a multimodal mechanochromophore in polymers.Bridging two pyrans with the sterically constrained dihydroanthracene is helpful to control the steric effect for the favorable formation of a distinctly appreciable bis-merocyanine(bis-MC)product.By varying the length of the polymer chains,the force delivered to the mechanophore is modulated,resulting in a gradient change in the relative distribution of two distinctly colored MC products and a multicolor mechanochromism.Mechanical activation of this bis-naphthopyanes proceeds via a mechanistically distinct pathway compared to the photochemical process.In addition,the bulk films can also achieve pronounced color changes when subjected to mechanical force.This study thus further expands the molecular diversity of mechanochromophores and tune the multimodal switch properties of bis-naphthopyrans based polymers.

关键词： Mechanochromic Photochromic Naphthopyan Multicolor Dihydroanthracene

Harnessing antimicrobial peptide-coupled photosensitizer to combat drug-resistant biofilm infections through enhanced photodynamic therapy

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Acta Pharmaceutica Sinica B 2024年第4期14卷 1759-1771页

作者： Duoyang Fan Xiaohui Liu Yueming Ren Ziheng Luo yanbing Li Jie Dong Seraphine VWegner Fei chen Wenbin Zeng Xiangya School of Pharmaceutical Sciences Central South UniversityChangsha 410013China Hunan Key Laboratory of Diagnostic and Therapeutic Drug Research for Chronic Diseases Central South UniversityChangsha 410013China Sir William Dunn School of Pathology University of OxfordOxford OX13REUK Xiangya Hospital of Central South University Changsha 410013China Institute of Physiological Chemistry and Pathobiochemistry University of MünsterMünster 48149Germany

Bacterial biofilm-associated infection was one of the most serious threats to human health. However, effective drugs for drug-resistance bacteria or biofilms remain rarely reported. Here, we propose an innovative strategy to develop a multifunctional antimicrobial agent with broad-spectrum antibacterial activity by coupling photosensitizers (PSs) with antimicrobial peptides (AMPs). This strategy capitalizes on the ability of PSs to generate reactive oxygen species (ROS) and the membrane-targeting property of AMPs (KRWWKWIRW, a peptide screened by an artificial neural network), synergistically enhancing the antimicrobial activity. In addition, unlike conventional aggregation-caused quenching (ACQ) photosensitizers, aggregation-induced emission (AIE) PSs show stronger fluorescence emission in the aggregated state to help visualize the antibacterial mechanism. In vitro antibacterial experiments demonstrated the excellent killing effects of the developed agent against both Gram-positive (G^(+)) and Gram-negative (G^(–)) bacteria. The bacterial-aggregations induced ability enhanced the photoactivatable antibacterial activity against G^(–) bacteria. Notably, it exhibited a significant effect on destroying MRSA biofilms. Moreover, it also showed remarkable efficacy in treating wound infections in mice in vivo. This multifunctional antimicrobial agent holds significant potential in addressing the challenges posed by bacterial biofilm-associated infections and drug-resistant bacteria.

关键词： Photodynamic therapy Antimicrobial peptides Multidrug-resistant bacteria Aggregation-induced emission Anti-biofilm

Revisiting the sodium-ion storage capability of hard carbon in carbonate-based electrolytes via a sodium-metal-free protocol

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Science China Chemistry 2024年第7期67卷 2240-2247页

作者： Gaopan Liu yanbing Mo Jiawei chen Yu Peng Xiao Zhu Fei Wang Xiaoli Dong Yongyao Xia Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Institute of New EnergyLaboratory of Advanced MaterialsFudan UniversityShanghai 200438China

Common evaluation methodology of sodium(Na)-containing two-electrode or three-electrode configurations overlooks the interference from highly reactive Na metal,leading to the underestimation or inconsistent performance of low-potential hard carbon(HC)electrodes.Herein,the trap of Na metal was systematically investigated with or without applied current,uncovering its inadequacy as the reference or counter electrode in different configurations.A Na-metal-free three-electrode protocol is proposed for evaluating the actual Na^(+)-storage capability of the typical low-potential HC electrode.By avoiding Na crosstalk and precisely controlling the working electrode's potential,the actual electrochemical performance of HC in the carbonate esterbased electrolyte can be recognized with high capacity of 222 mAh g^(-1)at 2 C and 113 mAh g^(-1)at 5 C,correcting the misunderstanding of the inferior performance of HC in coin-type half cells(68%and 50%undervaluation at 2 C and 5 C,respectively).The advanced protocol is expected to reduce misunderstandings or underestimation due to evaluation methods and to guide the development of high-performance battery materials.

关键词： highly reactive sodium potential drift carbonate ester sodium-metal-free protocol sodium storage capability

Localization in modified polar representation: hybrid measurements and closed-form solution

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Journal of Systems Engineering and Electronics 2024年第3期35卷 575-588页

作者： CONG Xunchao SUN Yimao YANG yanbing ZHANG Lei chen Liangyin The 10th Research Institute of China Electronics Technology Group Corporation Chengdu 610036China College of Computer Science and Institute for Industrial Internet Research Sichuan UniversityChengdu 610065China

Classical localization methods use Cartesian or Polar coordinates, which require a priori range information to determine whether to estimate position or to only find bearings. The modified polar representation (MPR) unifies near-field and farfield models, alleviating the thresholding effect. Current localization methods in MPR based on the angle of arrival (AOA) and time difference of arrival (TDOA) measurements resort to semidefinite relaxation (SDR) and Gauss-Newton iteration, which are computationally complex and face the possible diverge problem. This paper formulates a pseudo linear equation between the measurements and the unknown MPR position,which leads to a closed-form solution for the hybrid TDOA-AOA localization problem, namely hybrid constrained optimization(HCO). HCO attains Cramér-Rao bound (CRB)-level accuracy for mild Gaussian noise. Compared with the existing closed-form solutions for the hybrid TDOA-AOA case, HCO provides comparable performance to the hybrid generalized trust region subproblem (HGTRS) solution and is better than the hybrid successive unconstrained minimization (HSUM) solution in large noise region. Its computational complexity is lower than that of HGTRS. Simulations validate the performance of HCO achieves the CRB that the maximum likelihood estimator (MLE) attains if the noise is small, but the MLE deviates from CRB earlier.

关键词： localization modified polar representation time difference of arrival(TDOA) angle of arrival(AOA) closed-form solution

Inhibition of the NF-κB Signaling Pathway Improves Cigarette Mainstream Smoke-Induced Lung Injury and Gut Microbiota Disturbance

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Biomedical and Environmental Sciences 2024年第6期37卷 676-681页

作者： Hong Huang Shengjie Li Lifang Zeng Yan Zhang Ying chen yanbing Ma Jing Wei Changwei Zou Tingtao chen School of Resources and Environment Nanchang UniversityNanchang 330031JiangxiChina National Engineering Research Center for Bioengineering Drugs and the Technologies Institute of Translational MedicineJiangxi Medical CollegeNanchang UniversityNanchang 330031JiangxiChina School of Pharmacy Jiangxi Medical CollegeNanchang UniversityNanchang 330006JiangxiChina

Currently,cigarette smoke(CS)remains a major contributor to disease morbidity and mortality.CS can be divided into cigarette mainstream smoke(CMS)and side-stream smoke,depending on where it is produced by burning tobacco^([1]).CMS is inhaled by smokers from the filter end during cigarette combustion and is strongly associated with the development of several diseases^([2-4]).

关键词： smoke CMS cigarette

中国STEM领域的性别分化:基于社会分类的视角

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社会 2023年第6期43卷 209-242页

作者：陈彦冰中国人民大学社会学理论与方法研究中心

本研究利用CGSS2018与CGSS2021的数据构建了“STEM教育”与“STEM职业”两个变量,试图分析中国STEM领域的性别分化。一方面,中国高等教育群体中女性接受STEM教育的比例比男性更低,接受过STEM教育的女性在婚姻与生育的影响下也比男性更... 详细信息

本研究利用CGSS2018与CGSS2021的数据构建了“STEM教育”与“STEM职业”两个变量,试图分析中国STEM领域的性别分化。一方面,中国高等教育群体中女性接受STEM教育的比例比男性更低,接受过STEM教育的女性在婚姻与生育的影响下也比男性更可能离开劳动力市场;在STEM职业的从业者中,女性也面临着收入上的劣势。另一方面,在接受过STEM教育的劳动力群体中,女性比男性更可能从事STEM职业。STEM领域的性别分化并非不平等持久再生产的模式,它与多维度的分类系统密切关联,而且受到情境与主体性的影响。

关键词：性别 STEM教育 STEM职业性别主体性社会分类